Updates your HTML to use the minified jQuery instead of the development version

Remove unneeded references from HTML (like a root folder favicon)

Runs your JavaScript through a code quality tool (optional)

Add the build script to your project

Since we split out the build scripts from the main h5bp repo, you now have more options on how to integrate a build script into your project. Beyond the choice of technology, there's also the choice of how to integrate the build script of choice into your h5bp project or local repo. There is nothing stopping you from manually dropping the build script in to your HTML5 Boilerplate project. That works.

However, if you'd like to merge it into your main repository and preserve the build script commit history, please follow this workflow:

This means that OS X versions prior to 10.6 are no longer supported out of the box.
SoyLatte provides 10.4 and 10.5 builds of OpenJDK 7 for Intel OS X machines. However, only OS X 10.5 builds of OpenJDK 7 are available for PowerPC based Macs due to a bug in the 10.4 Compiler.
( Be sure to read the Download link as the archives are password protected "to provide a click though agreement" of the JDK licensing. )

Alternatively, YUI Compressor, which requires Java > 1.4, could be swapped out for Closure Compiler.